Pin mounting



Patented ec. 212, 193

UNrrs STATES PATENT GFFIE PIN MOUNTING of Delaware Application December31, 1934, Serial No. 759,936

6 Claims.

My invention relates in general to drawing and measuring instruments andthe like and has more particular reference to novel means for mountingpointed pins more especially on Compasses, dividers, et cetera.

An important object is to provide an adjustable mounting for pointedpins and the like whereby the pin is not touched in adjusting the sameand possibility of injury to the pin or to the person accomplishing theadjustment is avoided.

Another object is to provide an adjustable mounting for pointed pinswherein the pin may be adjusted and secured in adjusted position bycontrolling common adjusting and clamping means. Y

Another object is to provide a pin shifting and clamping device moreespecially adapted to mounting a pointed pin as on the leg of a compassor divider.

Another object is to provide a pin mounting including a clamping elementmanually operable to secure the pin in adjusted position, the clampingelement being also operable to shift the pin longitudinally in ordertoadjust the same on the mounting.

Another object is to utilize a formed plate to frictionally secure thepin on the clamp so that the same m'ay be shifted longitudinally bymanipulation of the clamp.

Numerous other objects, advantages, and inherent functions of theinvention will become apparent as the same is more fully understood fromthe following description, which, taken in connection with theaccompanying drawing, discloses a preferred embodiment of the invention.

' Referring to the drawing:

Figure 1 is a partial view of a drawing instrument provided with a pinmounting embodying my present invention;

Figure 2 is an enlarged sectional view taken substantially along theline 2-2 in Figure l;

Figure 3 is an exploded view of the several parts forming the pinmounting; and

Figure 4 is a sectional View taken substantially along the line 4 4 inFigure 2.

To illustrate the invention, I have shown on the drawing an instrumentII, which may be a compass, divider, or other instrument, on which ismounted a pointed pin I3. The instrument shown has a leg I5, on whichthe pin I3 is adjustably supported by means of a mounting embodying mypresent invention. The instrument also has another leg I'I, whichcarries a marking device, where the instrument is used as a compass, oranother pointed pin, where the instrument is to function as a divider.It may be necessary to adjust the position of the pointed pin I3 on theleg I5, particularly where the instrument II comprises a compass, inwhich the scribing device on the leg I'I may become worn olf necestistating adjustment of the pin I3 on the leg I5 in order to compensatefor such wear.

I have provided a mounting by means of which the pin may not only besecured on the leg I5 but also may be adjusted thereon without thenecessity of touching the pin during adjustment. The mounting moreoverpermits adjustment of the pin and clamping of the same in adjustedposition simultaneously. To this end, the leg I5 is provided with anelongated opening I9, terminating short of the end of the leg. The innerface of the leg is provided with a groove 2I extending from the end ofthe opening I9 to the end of the leg.

The clamping and adjusting device comprises a bolt 23 having screwthreads at one end for the reception of a clamping nut 25, the bolt atits opposite end being provided with a diametral opening 2'I of a sizesucient to receive the pin I3 therein. The bolt 23 is mounted on the legin position extending through the opening I9 with the threaded portionof the bolt carrying the nut 25 extending on one side of the leg, theperforated portion of the bolt carrying the pin I3 extending on theopposite side of the leg. The pin I3, when so mounted, has an endextending in the groove 2|, the tip of the pin projecting outwardly ofthe end of the leg. In order to permit the pin to be clamped securely onthe leg by tightening the nut 25, I provide a clamping plate 29 having acentral, preferably U-shaped grooveV 3i and flanges 33. This platealsohas a central perforation in the groove 3I, said perforation beinglarge enough to accommodate the bolt 23. The plate 29 is assembled onthe bolt behind the pin 2l so that the pin lies in the groove 3I, theplate portions forming the groove extending in the opening I9 and theflanges 33 of the plate riding and bearing on the surfaces of the legportions defining the opposite sides of the slot I9. If desired, awasher 3l may also be assembled on the bolt 23 between the facingsurfaces of the nut 25 and the leg.

It will be seen that when the nut 25 is screwed down tightly on the bolt23, the bolt will be drawn through the opening I9 in a direction to seatthe pin 21 tightly in the groove of the plate 29 and also to seat themarginal flanges of the plate tightly on the leg so that the pin will befric- 55 tionally held against longitudinal movement with respect to theleg. By loosening the nut 25 on the bolt, the frictional engagementbetween the plate flanges and the leg may be reduced sufficiently topermit the entire assembly to be moved longitudinally on the leg byapplying pressure in the desired direction on the nut 25 and withoutdisturbing the relative position of the pin in the bolt, the frictionalengagement of the pin with the plate serving to hold the pin in place inthe bolt during the longitudinal adjustment. The pin is thus carriedwith the bolt and may be adjusted on the leg to any desired positionwithout being directly touched. When the pin is in a desired adjustedposition with respectto the leg, it may be clamped in place simply bytightening the nut 25.

While I have shown an instrument of the socalled bow type, it Will beobvious that the invention is not necessarily restricted to theparticular form of instrument illustrated but may be applied to anyinstrument in which an adjustable needle point mounting is required. Thenut and bolt may, of course, be made of yany suitable preferablymetallic material in any convenient manner as on a screw machine and theleg, pin, and washer may likewise be fashioned in any suitable orpreferred form or manner. The clamping plate '29 also may be fashionedfrom suitable material, preferably sheet metal, by a simple punching orstamping operation.

The adjustable clamp of Ymy present invention has the advantage that itpermits'adjustment of the pointed pin or needle I3 without touching thesame and thus eliminates danger of either damaging the point or injuringthe person accomplishing the adjustment. The adjustable clamp mountinghas the further advantage that adjustment and clamping are accomplishedby vthe single operation of manipulating the clamping nut 25.

It is thought that the invention and numerous of its attendantadvantages will be understood from the foregoing description and it isobvious that numerous changes may be made in -the form, construction,and arrangement of the several parts of the illustrated apparatuswithout departing from the spirit or scope of my invention orsacrificing any of its attendant advantages, the preferred'modes andforms herein describedbeing merely for the purpose of illustrating theinvention.

lHaving thus described my invention, what I claim as new and desire tosecure by VLetters Patent is as follows:

1. The combination with a support element having an elongated slot, ofmeans for adjustably mounting a pin on said element, said meanscomprising a member extending in the slot and longitudinally movabletherein and having ends projecting on opposite sides of the supportelement, one of said ends having an opening for the reception -oftheipin whereby the same may be supported on one Iside of said elementand shifted thereon with said member, and clamping means comprising aplate held on one end of said memvberbysaid pin in position to engageone side of the support element, and a clamp co-operatively:associatedwithithe other end of said member in `-positionlto co-0peratewith the opposite side of the support Yelement whereby to clampinglysecure the pinon saidplate and to clamp said support element between theplate and the clamp solely by the manipulation of said clamp.

`2. The `combination as set forth Vin claim l, whereinsaid plate `'isformed with a groove for the reception,.ofsaid,pin.

3. The .combination-as set forth in claim 1, wherein said membercomprises a bolt having a threaded portion and the clamp comprises a nut:5o-operatively associated with the threaded portion of said bolt.

4. The combination as set forth in claim l wherein the element ononesidethereof is formed with a groove at the end of the slot, thegroove being adapted to receive and prevent lateral movement of the pinwith respect to thesupport element.

5. The combination with a support element, of means for adjustablymounting a vpin thereon, said means comprising a stem having a diametralopening in an end thereof, said stem being longitudinally shiftable onsaid element, a resilient plate on said stem and clamping means tosecure the stem on the support element and draw .the resilient plateagainst the support element Whereby to yieldingly secure the pin in saiddiametral opening.

6. The combination with a support element having a longitudinal groovetherein forming a pin seat, of means for adjustably mounting a pin onthe support element'in position extending in said groove, said meanscomprising a stem having a diametral opening in an endthereof, saidstern being longitudinally shiftable on said element, a resilient plateon said stem and `clamping means to secure the stem on the supportelement and to draw the resilient plate ,against the support elementwhereby to yieldingly secure the pin in said diametral opening andonsaid seat.

LOUIS F. PARR.

